<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>文件上传、下载</title>
</head>

<body>
  <form action="http://localhost:9000/upload" method="post" enctype="multipart/form-data">
    <div>
      <label for="">请选择文件：</label><input type="file" name="file" value="选择文件">
    </div>
    <input type="submit" name="file" value="上传">
  </form>
</body>
</html>